2. Working PrincipleA heat sensor is installed at the water-outlet of the constant temperature mixed water valve, the valve core in the valve body is moved by the temperature sensor to block or open the cold, hot water-inlet. The hot water opening is increased while the cold water opening is decreased, when the temperature adjusting knob sets a certain temperature, the cold, hot water ratio at the water-outlet will be changed as well regardless of the change of the cold water-in or hot water-in temperature, therefore, the constant water-out temperature is ensured.